The picture shows the size of the pupil under two different conditions. What makes the pupil change size between condictions 1 and 2?

When the amount of light entering the eye is reduced, such as in a dimly lit room, the pupil dilates or becomes larger to allow more light to enter the eye. This is controlled by the muscles in the iris, which contract to increase the size of the pupil. On the other hand, when the amount of light entering the eye is increased, such as in bright sunlight, the pupil constricts or becomes smaller to reduce the amount of light entering the eye. This is also controlled by the muscles in the iris, which relax to decrease the size of the pupil.

E M B I B E

Science Textbook of Competency Based Questions for Class VIII>Chapter 13 - Light>Exercise>Q 6

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IMPORTANT

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Which of these objects reflects light?

53.13% studentsanswered this correctly

Important Questions on Light

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Science Textbook of Competency Based Questions for Class VIII>Chapter 13 - Light>Exercise>Q 7

The diagram shows the basic parts of human eye.

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Which part protects the human eye from injury?

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Science Textbook of Competency Based Questions for Class VIII>Chapter 13 - Light>Exercise>Q 8

The picture shows the size of the pupil under two different conditions.

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What makes the pupil change size between condictions 1 and 2?

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Science Textbook of Competency Based Questions for Class VIII>Chapter 13 - Light>Exercise>Q 9

Light is falling on surface

S_{1}, S_{2}, S_{3}

as shown in the figure below:
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Surfaces on which the angle of incidence is equal to the angle of reflection is/are:

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Science Textbook of Competency Based Questions for Class VIII>Chapter 13 - Light>Exercise>Q 10

A small hole P is made in a piece of cardboard. The hole is illuminated by a torch as shown in the figure below. The ray of light coming out of the hole falls on a mirror.
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At which point should the eye be placed so that the hole can be seen?

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Science Textbook of Competency Based Questions for Class VIII>Chapter 13 - Light>Exercise>Q 11

Two mirrors A and B are placed at right angles to each other as shown in the figure below:
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A ray of light incident on mirror A at an angle of

25 °

falls on mirror B after reflection. The angle of reflection for the ray reflected from mirror B would be

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Science Textbook of Competency Based Questions for Class VIII>Chapter 13 - Light>Exercise>Q 12

We should not read in dim light.

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Science Textbook of Competency Based Questions for Class VIII>Chapter 13 - Light>Exercise>Q 14

A person with a myopic eye, cannot see objects beyond

1.2 m

distinctly. What can be said about the likely size of his eyeball ? State the nature of corrective lens needed to restore his proper vision ?

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Science Textbook of Competency Based Questions for Class VIII>Chapter 13 - Light>Exercise>Q 15

A tiny mirror M is fixed on a piece of cardboard placed on a table. The cardboard is illuminated by light from a bulb. The position of eye with respect to position of bulb is shown in figure as A, B, C and D. In which position mirror will be visible?

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